Out-of-bounds Read in Openbsd
CVE-2026-56099
OpenBSD before commit 6a23123 (2026-06-18) contains an out-of-bounds read vulnerability in the mpls_do_error function within sys/netmpls/mpls_input.c that allows remote attackers to disclose kernel stack memory by sending crafted MPLS fram…
Vulnerability class: Buffer Overflow
EPSS: 0.004 (34.8th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N.
Affected products
- Openbsd
- Openbsd Src — versions 0
Weakness classification (CWE)
References
- disclosure@vulncheck.com (Exploit, technical-description, Patch, Third Party Advisory, exploit)
- disclosure@vulncheck.com (Patch, patch)
- disclosure@vulncheck.com (Third Party Advisory, third-party-advisory)
- af854a3a-2127-422b-91ae-364da2661108 (Exploit, Patch, Mailing List, Third Party Advisory)
- af854a3a-2127-422b-91ae-364da2661108 (Exploit, Patch, Mailing List, Third Party Advisory)
Frequently asked questions
- What is CVE-2026-56099?
- CVE-2026-56099 is a medium-severity vulnerability in Openbsd, classified under Out-of-bounds Read. CVSS score: 5.3/10. Published 2026-06-18.
- How severe is CVE-2026-56099?
- Medium severity. CVSS v3 base score is 5.3 out of 10.